ci: switch sid tests to bullseye and allow failure

Signed-off-by: Ivo De Decker <ivodd@debian.org>

.gitlab-ci.yml

@@ -14,18 +14,21 @@ tests-buster:
     - apt-get install -y python3 python3-apt python3-yaml python3-coverage python3-pycodestyle pycodestyle python3-pytest python3-pytest-cov git rsync libclass-accessor-perl libdpkg-perl libyaml-syck-perl
     - ci/gitlab-ci-runner --with-coverage
   artifacts:
+    when: always
     paths:
      - coverage
      - codestyle
 
-tests-sid:
+tests-bullseye:
   stage: test
-  image: debian:sid
+  image: debian:bullseye
+  allow_failure: true
   script:
     - apt-get update
     - apt-get install -y python3 python3-apt python3-yaml python3-coverage python3-pycodestyle pycodestyle python3-pytest python3-pytest-cov git rsync libclass-accessor-perl libdpkg-perl libyaml-syck-perl
     - ci/gitlab-ci-runner --with-coverage
   artifacts:
+    when: always
     paths:
      - coverage
      - codestyle